Incandescent electric lamp



(No Model.)

G, W. TIMBRBLL & J. G. PYPE.- I

INGANDESGENT ELECTRIC LAMP.

No. 514,739. 7 Patented Feb. 13,1394.

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UNITED TATES PATENT GEORGE H. W. TIMBRELL AND JOHN C. FYEE, OF DENVER, COLORADO; SAID FYFE ASSIGNOR AND SAID TIMBRELL ASSIGNOR OF ONE-EIGHTH OFHIS INTEREST TO LEWIS F. KIMBALL AND STEPHEN W. WRIGHT, OF SAME PLACE, AND JAMES WHITE, OF CLEVELAND, OHIO.

INCANDYESCENT ELECTRIC LAMP.

, SPECIFICATION forming part of Letters Patent No. 514,739, dated February 13, 1894.

Application filed September 18, 1891. Renewed January 15 1894- Serial No. 4=96,992- (No model.)

To aZZ whom it may concern.-

Be it known that we, GEORGE H. W. TIM- BRELL and JOHN C. FYFE, citizens of the United States of America, residing at Denver,

in the county of Arapahoe and State of 0010- rado, have invented certain new and useful Improvements in Incandescent Lamps; and we do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

Our invention relates to improvements in incandescent electric lamps and the object of the invention is to increase the available candle power of the lamp by reflection, the refleeting surface being located within the vacuum bulb or globe.

The invention will be fully understood by reference to the accompanying drawings in which is illustrated an embodiment thereof. In the drawings, Figure 1 is an elevation of an incandescent lamp provided with our improvement. Fig. 2 is a similar view of a lamp provided with our reflector and adapted for use with a particular style of lamp holder. Fig. 3 shows a lamp holder and switch mechanism suitable for use in connection with the lamp shown in Fig. 2.

Similar reference characters indicating corresponding parts orelements of the mechan- 3 5 ism, let the numeral 3 designate the vacuum globe of the lamp provided with a reflecting surface '4: centrally located therein and surrounded by the filament 5. This filament as shown in the drawings is connected at the top of the reflector with one of the platinum or leading-in wires 9 as shown at 6. It is then coiled about the reflector and secured to the other leading-in wire or platinum conductor 10 at'the bottom of the reflector as shown at 7, the platinum wire being passed through the bottom of the reflector which is hermetically sealed therearound,and carried upward therethrough and out through thecap 12.

While the reflecting surface 4 may consist of any suitable material, we will assume for the purpose of this description, referring specially to Fig.1, that it consists of aglass tube closed at the bottom and terminating at the top in a solid glass part 14 through which the platinum conductors pass and within which they are sealed. It is not, however, necessary that this tubular reflector should be closed at the top, since it is hermetically sealed at the bottom, hence the top 14 need not be solid or closed and wire 10 maybe carried through an aperture therein without destroying or interfering in any way with the vacuum of bulb 3. Wire 9 must of course be sealed within the top 14 where it passes therethrough to the vacuum space of the bulb. The top 14 of the reflector may be secured within the cap 12 of the lamp in any suitable manner whereby the reflector is properly supported within the bulb.

Referring now specially to Fig. 2 it will be seen that the reflector is tubular and open at the top, thebottom being hermetically sealed where the platinum wire is carried therethrough in the manner already described with reference to Fig. 1. Wire 10 after passing through the bottom of the reflector in Fig. 2 is formed intoa spiral spring 15 and adapted to engage a metal rod 16 of the lamp holder through which the current passes as hereinafter described. The tube 4 is supported and the bulb 3 closed at the top by sealing or fusing the two parts together as shown at 17. Reflector 4: is provided near its top with an interior circumferential recess 18 within which is located a spring metal band 19 to which is secured one extremity of the platinum leading wire 9, which Wire is carried through the tube 4 and connected with the filament as described when referring to Fig. 1.

In connecting the lamp with the holder.

shown in Fig. 3 rod 16 is inserted in tube 4, its lower extremity engaging spring 15 and forming suitable contact therewith. The OP- posite extremity of this rod is made fast to the neck 20 of a switch socket 21, this neck being provided with yielding projections 22 i and spring 15.

The entire switch socket 21 is formed of some suitable insulating material as gutta percha or hard rubber to which the metallic brushes A, B, O and D are secured. Two of these brushes are located on each side of the key 26 which is also composed of insulating material and formed rectangularin cross section within the socket, and provided with a metal contact plate 27 on each of two opposite sides, one only being shown in the drawings. Then we may say the current passes from one pole of the electrical source through wire 25, brush G, contact plate 27, brush D, wire 25, rod 16, spring 15 to the filament and thence to the ring 19, projection 22, wire 24,

brush A, the contact plate 27 not shown,

brush B, to wire 24? and to the opposite pole of the electrical source, completing the circuit.

It must be understood that we do not intend to limit ourselves in this application to any particular style, shape or material for the construction of the reflector. The reflectors shown in the drawings may be considered tubular, composed of glass and having a suitable metallic lining forming reflecting mirrors. This style of construction of reflector must however be considered only typical of any suitable reflecting surface which it may be found desirable or advantageous to employ. For instance rod 16 may be composed of burnished metal and form the reflector for the lamp shown in Fig. 2. In this case tube 4 would not have the metallic lining since rod 16 would take the place thereof and the tube would act as a transparent shield for the rod, through which shield the rays from the luminous filament would be transmitted to and reflected from, the surface of the burnished rod.

The reflecting surface may be composed of a series of concave mirrors consisting of depressions formed in its outer surface. A refleeting surface of this description is intended to be represented in Fig. 2, the numeral 30 designating said depressions.

Having thus described our invention, what we claim is- 1. An incandescent electric lamp provided with a transparent tube projecting into the vacuum bulb and exteriorly sealed thereto, the wires leading to the filament being carried therethrough and sealed therein in combination with a detachable lamp holder provided with a reflecting rod adapted to enter the transparent tube and engage one of the leading wires, and suitable switch mechan ism connected with said rod and located in the circuit of the lamp, substantially as described.

2. An incandescent electric lamp provided with a transparent tube projecting into the vacuum bulb and exteriorly sealed thereto, a filament coiled around said tube, the wires leading to the filament being carried therethrough and sealed therein in combination with a detachable lamp holder provided with a metallic rod havinga polished or reflecting surface adapted to enter the transparent tube and engage one of theleading wires, and suitable switch mechanism connected with said rod and located in the circuit of the lamp, substantially as described.

3. An incandescent lamp having a tubular reflector provided near its top with a circumferential recess in which is located a metallic ring, leading wires passing through the walls of the reflector within which they are sealed, one of these wires being connected with the metallic ring, and a lamp holder provided with a neck adapted to slip within the reflector and suitable means for retaining the lamp in place thereon and completing the circuit through the lamp, substantially as described.

In testimony whereof we aiiixour signatures in presence of two witnesses.

GEORGE H. W. TIMBRELL. JOHN G. FYFE. Witnesses:

WM. MCCONNELL, G. J. ROLLANDET. 

